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“17. Underground workers in the Shinkolobwe Mine in the
Belgian Congo are receiving radon exposures which exceed the
maximum permissible level of the International Committee on
Radiological Protection, without any apparent evidence of i111
effects,
Because underground working for uranium has been going
on only for 12 years, it is probably too early to judge whether
or not this degree of exposure is harmful,
However, the quality
and interest of the health and safety staff of Union Miniere should
make it possible to maintain a continuing health study of the
mining population in order to determine definitely the hazards
of exposure to radon,